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प्रश्न
Acid rain is known to contain some acids. Name these acids and where from they come in rain?
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उत्तर
Rainwater has a pH of 5.6 due to the presence of H+ ions formed by the reaction of rainwater with carbon dioxide present in the atmosphere. The reaction can be shown as-
\[\ce{H2O (l) + CO2 (g) -> H2CO3 (aq)}\]
\[\ce{H2CO3 (aq) -> H+ (aq) + HCO^{-}3 (aq)}\]
If the pH of the rainwater falls below 5.6 then it is known as acid rain. NO2 after oxidation and reaction with water are major contributors to the acid rain.
\[\ce{2SO2 (g) + O2 (g) + 2H2O (l) -> 2H2SO4 (aq)}\]
\[\ce{4NO2 (g) + O2 (g) + 2H2O (l) -> 4HNO^{-}3 (aq)}\]
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| List - I | List - II | ||
|
(a) |
\[\ce{2SO2(g) + O2(g) -> 2SO3(g)}\] | (i) | Acid rain |
| (b) | \[\ce{HOCl(g) ->[hv] \overset{\bullet}{O}H + \overset{\bullet}{C}l}\] | (ii) | Smog |
| (c) | \[\ce{CaCO3 + H2SO4 -> CaSO4 + H2O + CO2}\] | (iii) | Ozone depletion |
| (d) | \[\ce{NO2(g) ->[hv] NO(g) + O(g)}\] | (iv) | Tropospheric pollution |
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